dojo.provide("lotex.report.Functions");
dojo.require("lotex.math");
dojo.require("lotex.array");
dojo.require("lotex.string");

lotex.report.Functions = {
    context: {},

    today: function(){
        var d, s = "";
        d = new Date();
        s += d.getFullYear() + "-";
        s += (d.getMonth() + 1) + "-";
        s += d.getDate() + "";
        return(s);
    },

    sum: function(a) {
        var count=0;
        for(var i=0;i<a.length;i++){
            var value = isNaN(parseInt(a[i])) ? 0 : parseInt(a[i]);
            //dojo.debug("a["+i+"]: "+value + " isNum: "+dojo.lang.isNumber(value));
            count += value;
        }
        return count;
    },

    // a/b
    percent: function(a, b) {
        var i = parseFloat(a);
        var j = parseFloat(b);
        if (dojo.lang.isNumber(i) && dojo.lang.isNumber(j)) {
            if(i==0) return "0";
            if(j==0) return "∞";
            var r = lotex.math.roundEx(100*(i/j), 2, true);
            r = r+"%";
            return r;
        }
        return "-";
    },

    //convertCurrency
    rmb: function(currencyDigits) {
    // Constants:
        var MAXIMUM_NUMBER = 99999999999.99;
        // Predefine the radix characters and currency symbols for output:
        var CN_ZERO = "零";
        var CN_ONE = "壹";
        var CN_TWO = "贰";
        var CN_THREE = "叁";
        var CN_FOUR = "肆";
        var CN_FIVE = "伍";
        var CN_SIX = "陆";
        var CN_SEVEN = "柒";
        var CN_EIGHT = "捌";
        var CN_NINE = "玖";
        var CN_TEN = "拾";
        var CN_HUNDRED = "佰";
        var CN_THOUSAND = "仟";
        var CN_TEN_THOUSAND = "万";
        var CN_HUNDRED_MILLION = "亿";
        var CN_SYMBOL = "人民币";
        var CN_DOLLAR = "元";
        var CN_TEN_CENT = "角";
        var CN_CENT = "分";
        var CN_INTEGER = "整";

    // Variables:
        var integral;    // Represent integral part of digit number.
        var decimal;    // Represent decimal part of digit number.
        var outputCharacters;    // The output result.
        var parts;
        var digits, radices, bigRadices, decimals;
        var zeroCount;
        var i, p, d;
        var quotient, modulus;

    // Validate input string:
        currencyDigits = currencyDigits.toString();
        if (currencyDigits == "") {
            alert("Empty input!");
            return "";
        }
        if (currencyDigits.match(/[^,.\d]/) != null) {
            alert("Invalid characters in the input string!");
            return "";
        }
        if ((currencyDigits).match(/^((\d{1,3}(,\d{3})*(.((\d{3},)*\d{1,3}))?)|(\d+(.\d+)?))$/) == null) {
            alert("Illegal format of digit number!");
            return "";
        }

    // Normalize the format of input digits:
        currencyDigits = currencyDigits.replace(/,/g, "");    // Remove comma delimiters.
        currencyDigits = currencyDigits.replace(/^0+/, "");    // Trim zeros at the beginning.
        // Assert the number is not greater than the maximum number.
        if (Number(currencyDigits) > MAXIMUM_NUMBER) {
            alert("Too large a number to convert!");
            return "";
        }

    // Process the coversion from currency digits to characters:
        // Separate integral and decimal parts before processing coversion:
        parts = currencyDigits.split(".");
        if (parts.length > 1) {
            integral = parts[0];
            decimal = parts[1];
            // Cut down redundant decimal digits that are after the second.
            decimal = decimal.substr(0, 2);
        }
        else {
            integral = parts[0];
            decimal = "";
        }
        // Prepare the characters corresponding to the digits:
        digits = new Array(CN_ZERO, CN_ONE, CN_TWO, CN_THREE, CN_FOUR, CN_FIVE, CN_SIX, CN_SEVEN, CN_EIGHT, CN_NINE);
        radices = new Array("", CN_TEN, CN_HUNDRED, CN_THOUSAND);
        bigRadices = new Array("", CN_TEN_THOUSAND, CN_HUNDRED_MILLION);
        decimals = new Array(CN_TEN_CENT, CN_CENT);
        // Start processing:
        outputCharacters = "";
        // Process integral part if it is larger than 0:
        if (Number(integral) > 0) {
            zeroCount = 0;
            for (i = 0; i < integral.length; i++) {
                p = integral.length - i - 1;
                d = integral.substr(i, 1);
                quotient = p / 4;
                modulus = p % 4;
                if (d == "0") {
                    zeroCount++;
                }
                else {
                    if (zeroCount > 0)
                    {
                        outputCharacters += digits[0];
                    }
                    zeroCount = 0;
                    outputCharacters += digits[Number(d)] + radices[modulus];
                }
                if (modulus == 0 && zeroCount < 4) {
                    outputCharacters += bigRadices[quotient];
                }
            }
            outputCharacters += CN_DOLLAR;
        }
        // Process decimal part if there is:
        if (decimal != "") {
            for (i = 0; i < decimal.length; i++) {
                d = decimal.substr(i, 1);
                if (d != "0") {
                    outputCharacters += digits[Number(d)] + decimals[i];
                }
            }
        }
        // Confirm and return the final output string:
        if (outputCharacters == "") {
            outputCharacters = CN_ZERO + CN_DOLLAR;
        }
        if (decimal == "") {
            outputCharacters += CN_INTEGER;
        }
        outputCharacters = CN_SYMBOL + outputCharacters;
        return outputCharacters;
    }

}